graphics/gexiv2 doesn't compile after latest update

[Piotr Kubaj]

The problem is that exiv2.10 is looked for, but it should look for 
exiv2.12. The patch for it is:

--- /usr/ports/graphics/gexiv2/Makefile    2012-08-01 02:22:09.137343158 
+0200
+++ /usr/ports/graphics/gexiv2/Makefile.old    2012-08-01 
02:21:51.138339987 +0200
@@ -17,7 +17,7 @@

  BUILD_DEPENDS=    libtool:${PORTSDIR}/devel/libtool \
          gm4:${PORTSDIR}/devel/m4
-LIB_DEPENDS=    exiv2.12:${PORTSDIR}/graphics/exiv2
+LIB_DEPENDS=    exiv2.10:${PORTSDIR}/graphics/exiv2

  USE_BZIP2=    yes
  USE_GNOME=    glib20